package com.example.forum.service.impl;

import com.example.forum.common.AppResult;
import com.example.forum.common.ResultCode;
import com.example.forum.dao.ArticleMapper;
import com.example.forum.exception.ApplicationException;
import com.example.forum.model.Article;
import com.example.forum.model.Board;
import com.example.forum.model.User;
import com.example.forum.service.IArticleService;
import com.example.forum.service.IBoardService;
import com.example.forum.service.IUserService;
import com.example.forum.utils.StringUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.Date;
import java.util.List;

@Slf4j
@Service
public class ArticleServiceImpl implements IArticleService {

    @Resource
    private ArticleMapper articleMapper;
    //用户和板块的操作
    @Resource
    private IUserService userService;
    @Resource
    private IBoardService boardService;

    @Override
    public void create(Article article) {
        if(article==null||article.getUserId()==null||article.getBoardId()==null
                ||StringUtil.isEmpty(article.getTitle())
                ||StringUtil.isEmpty(article.getContent())){
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        //设置默认值
        article.setVisitCount(0);
        article.setReplyCount(0);
        article.setLikeCount(0);
        article.setDeleteState((byte)0);
        Date date=new Date();
        article.setCreateTime(date);
        article.setUpdateTime(date);
        //写入数据库
        int articleRow=articleMapper.insertSelective(article);
        if(articleRow<=0){
            log.warn(ResultCode.FAILED_CREATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_CREATE));
        }
        //获取用户信息
        User user=userService.selectById(article.getUserId());
        //没有找到指定用户信息
        if(user==null){
            log.warn(ResultCode.FAILED_CREATE.toString()+"，发帖失败，用户id="+article.getUserId());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_CREATE));
        }
        //更新用户的发帖数
        userService.addOneArticleCountById(user.getId());
        //获取板块信息
        Board board=boardService.selectById(article.getBoardId());
        //数据库中是否有对应板块
        if(board==null){
            log.warn(ResultCode.FAILED_CREATE.toString()+"，发帖失败，用户id="+article.getUserId());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_CREATE));
        }
        //更新板块中的帖子数量
        boardService.addOneArticleCountById(board.getId());
        //打印日志
        log.info(ResultCode.SUCCESS.toString()+"，user id="+article.getUserId()
                +"，board id="+article.getBoardId()+"，article id="+article.getId()+"发帖成功");
    }

    @Override
    public List<Article> selectAll() {
        //调用DAO
        List<Article> articles=articleMapper.selectAll();
        //返回结果
        return articles;
    }

    @Override
    public List<Article> selectAllByBoardId(Long boardId) {
        //非空校验
        if(boardId==null||boardId<=0){
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        //校验版块是否存在
        Board board=boardService.selectById(boardId);
        if(board==null){
            log.warn(ResultCode.FAILED_BOARD_NOT_EXISTS.toString()+"，board id="+boardId);
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_BOARD_NOT_EXISTS));
        }
        //调用DAO，查询
        List<Article> articles=articleMapper.selectAllByBoardId(boardId);
        //返回结果
        return articles;
    }

    @Override
    public List<Article> selectByUserId(Long userId) {
        //非空校验
        if(userId==null||userId<=0){
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        //校验用户是否存在
        User user=userService.selectById(userId);
        if(user==null){
            log.warn(ResultCode.FAILED_USER_NOT_EXISTS.toString()+"，user id="+userId);
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_USER_NOT_EXISTS));
        }
        //调用DAO
        List<Article> articles=articleMapper.selectByUserId(userId);
        //返回结果
        return articles;
    }

    @Override
    public Article selectDetailById(Long id) {
        //非空校验
        if(id==null||id<=0){
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        //调用DAO
        Article article=articleMapper.selectDetailById(id);
        //判断结果是否为空
        if(article==null){
            log.warn(ResultCode.FAILED_ARTICLE_NOT_EXISTS.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_ARTICLE_NOT_EXISTS));
        }
        //更新帖子的访问次数
        Article updateArticle=new Article();
        updateArticle.setId(article.getId());
        updateArticle.setVisitCount(article.getVisitCount()+1);
        //保存到数据库
        int row=articleMapper.updateByPrimaryKeySelective(updateArticle);
        if(row!=1){
            log.warn(ResultCode.ERROR_SERVICES.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.ERROR_SERVICES));

        }
        //更新返回对象的访问次数
        article.setVisitCount(article.getVisitCount()+1);
        //返回帖子详情
        return article;
    }

    @Override
    public Article selectById(Long id) {
        //非空校验
        if(id==null||id<=0){
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        //调用DAO
        Article article=articleMapper.selectByPrimaryKey(id);
        return article;
    }

    @Override
    public void modify(Long id, String title, String content) {
        //非空校验
        if(id==null||id<=0||StringUtil.isEmpty(title)||StringUtil.isEmpty(content)){
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        Article updateArticle=new Article();
        updateArticle.setId(id);
        updateArticle.setTitle(title);
        updateArticle.setContent(content);
        updateArticle.setUpdateTime(new Date());
        //调用DAO
        int row=articleMapper.updateByPrimaryKeySelective(updateArticle);
        if(row!=1){
            log.warn(ResultCode.ERROR_SERVICES.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
    }

    @Override
    public void thumbsUpById(Long id) {
        if(id==null||id<=0){
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        //获取帖子详情
        Article article=articleMapper.selectByPrimaryKey(id);
        //帖子不存在
        if(article==null||article.getDeleteState()==1){
            log.warn(ResultCode.FAILED_ARTICLE_NOT_EXISTS.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_ARTICLE_NOT_EXISTS));
        }
        //帖子状态异常
        if(article.getState()==1){
            log.warn(ResultCode.FAILED_ARTICLE_BANNED.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_ARTICLE_BANNED));
        }
        //构造要更新的对象
        Article updateArticle=new Article();
        updateArticle.setId(article.getId());
        updateArticle.setLikeCount(article.getLikeCount()+1);
        updateArticle.setUpdateTime(new Date());
        //调用
        int row=articleMapper.updateByPrimaryKeySelective(updateArticle);
        if(row!=1){
            log.warn(ResultCode.ERROR_SERVICES.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
    }

    @Override
    public void deleteById(Long id) {
        if(id==null||id<=0){
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        //根据id查询帖子信息
        Article article=articleMapper.selectByPrimaryKey(id);
        if(article==null||article.getDeleteState()==1){
            log.warn(ResultCode.FAILED_BOARD_NOT_EXISTS.toString()+"，article id="+id);
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_BOARD_NOT_EXISTS));
        }
        //构造一个更新对象
        Article updateArticle=new Article();
        updateArticle.setId(article.getId());
        updateArticle.setDeleteState((byte)1);
        //调用DAO
        int row=articleMapper.updateByPrimaryKeySelective(updateArticle);
        if(row!=1){
            log.warn(ResultCode.ERROR_SERVICES.toString());
            throw new ApplicationException(AppResult.failed(ResultCode.ERROR_SERVICES));
        }
        //更新版块中的帖子数量
        boardService.subOneArticleCountById(article.getBoardId());
        //更新用户发帖数量
        userService.subArticleCountById(article.getUserId());
        log.info("删除帖子成功，article id="+article.getId()+"，user id="+article.getUserId());
    }

    @Override
    public void addOneReplyCountById(Long id) {
        // 非空校验
        if (id == null || id <= 0) {
            // 打印日志
            log.warn(ResultCode.FAILED_PARAMS_VALIDATE.toString());
            // 抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_PARAMS_VALIDATE));
        }
        // 获取帖子记录
        Article article = articleMapper.selectByPrimaryKey(id);
        // 校验帖子状态
        if (article == null || article.getDeleteState() == 1) {
            // 打印日志
            log.warn(ResultCode.FAILED_ARTICLE_NOT_EXISTS.toString());
            // 抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_ARTICLE_NOT_EXISTS));
        }
        // 帖子已封帖
        if (article.getState() == 1) {
            // 打印日志
            log.warn(ResultCode.FAILED_ARTICLE_BANNED.toString());
            // 抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.FAILED_ARTICLE_BANNED));
        }

        // 构造更新对象
        Article updateArticle = new Article();
        updateArticle.setId(article.getId());
        // 回复数 = 原回复数 + 1
        updateArticle.setReplyCount(article.getReplyCount() + 1);
        updateArticle.setUpdateTime(new Date());
        // 执行更新
        int row = articleMapper.updateByPrimaryKeySelective(updateArticle);
        if (row != 1) {
            // 打印日志
            log.warn(ResultCode.ERROR_SERVICES.toString());
            // 抛出异常
            throw new ApplicationException(AppResult.failed(ResultCode.ERROR_SERVICES));
        }
    }
}
